Newton



(No Model.) 2 Sheets-Sheet 1..

P. M. NEWTON. ARC LAMP.

N0. 300,999. Patented June 24, 1884.

(No Model.) 2 Sheets$heet 2.

P. M. NEWTON.

ARC LAMP.

No. 300,999. Patented June 24, 18.84:.

NITED STATES ArnNr @FEEIQR ARC LAM P.

SPECIFICATION forming part of Letters Patent No. 300,999, dated June 24,1884:.

Application filed November 28, 1883. (No model.) Patented in EnglandMarch 31,' 1883, No. 1,623.

To CLZZ whom) it may concern..-

Be it known that I, FRANCIS MURRAY NEW- TON, a subject of the Queen ofGreat Britain and Ireland, residing at Belfast, in the county of Antrim,Kingdom of Great Britain and Ireland, have invented a new and usefulImproved Electric-Arc Lamp, of which the following is a specification.

In an electric-arc lamp according to my in vention, the feeding of thecarbon or of its holder, or it may be of both carbons or holders, iseffected by a device moving with a vibrating or reciprocating motion.During the forward or acting portion of this Vibrating or reciprocatingmotion, the device takes a firm hold of the carbon or its holder, andduring its backward or idle stroke the device slides freely over thesaid carbon or its holder. Thus an intermittent feed is imparted to thecarbon during the-time that the above-mentioned device is in vibrationor reciprocation. During the intervals, when the carbon is not actuallymoving forward, it is held by a second device, which offers sufficientresistance to its forward 'motion to maintain it in position against theinfluence of gravity, jarring, and the like, and a similar or stillgreater resistance against its backward motion, so that the carbon maynot be carried back by the idle stroke of the vibrating device. If thevibrating device is properly adjusted, it will be suficient for thesecond device to give an equal pressure in both directions after themanner of a brake. The vibrating device derives its motion from anelectro-magnet or solenoid in the main circuit, or in a derivationthereof, or in a shunt-circuit round the are, according as the lamp isintended to burn alone, or in parallel circuit, or in series. Thismagnet or solenoid acts upon an armature or core, which ,in the courseof its motion, operates a make-and-break ar rangement, by which some orall of the con volutions of the conductor on the magnet or solenoid areshort-circuited or cut out of circuit; hence the power of the magnet is,so long as the vibrating motion is kept up, alternately increased anddiminished. The are is struck either by lowering the negative carbon byan electro-magnet or solenoid, or the whole of the previously-describedfeed-arrangement may be raised by similar means.

Referring to the accompanying sheet of drawings, Figure 1 is anelevation, partly in section, of an arc lamp embodying my invention, thecover being supposed to be removed.

Fig. 2 is a plan of the same. Fig. 3 is a sectional view of the deviceA, and Fig. 4 aplan of the same.

A is a vibrating device hinged or pivoted by the arm B'to the standard0, and surrounding the carbon or electrode. Its interior is providedwith fingers, feelers, or cams, here shown as elastic wires A,fixed in afoundation, A of metal, leather, or india-rubber, after the manner ofwire-card filleting. The points of these wires normally inolose acylindrical space rather less in diameter than the carbon D (or holder)they are intended to grasp,

and hence when the carbon D (or holder) is passed through them fromabove they are deflected, and thus form a series of toggle-like arms,which oppose but a very slight resistance to the motion of the device A(relatively to the carbon D) in one direction, but take a firm grip onthe carbon D when the device A is moved in the other direction. E is asta tionary device similar in construction to the vibrating device A. Itobtains sufficient frictional hold of the carbon D to maintain itagainst motion in the direction of the arc in opposition to the actionof gravity, jarring, and the like, but cannot retain it against theadditional impulse of the forward stroke of the vibrating device A. Inthe opposite direction the device E obtains a firm grasp, as alreadyexplained with regard to A. The diameter of the space inclosed by thepoints of the elastic fingers, both in A and E, can be varied by screws,which draw the sides of the case more tightly together. The vibration ofthe device A is effected by the electro-magnet G, which is situated in ashunt-circuit around the are in a manner which is well understood. Thismagnet attracts an armature, F, connected to the vibrating device A; butso long as the are does not exceed its normal length the attraction isnot suflicient to overcome the power of the spring H. When, however, thelength of the arc increases beyond the determined amount, theattractionof the magnet overcomes the spring, and the armature, with the device A,is drawn down. Immediately it has moved the sluint-circuit is brokenwhere i it crosses the COIIiZZIClrPOiDtS at 1', the magnet loses itspower, and the armature rises, carrying the device A. with it intoposition, ready for the next stroke, which occurs immediately thecontact-pieces touch, unless the previous stroke has reduced the arc tothe desired. length. The course of the current through the lamp is asfollows: it enters at the terminal iii, passes by the wire L to thecasing 3i, thence through. the contact-springs N N to the upper carbon,1), across the are to the negative carbon 0, and. from its holder to thecore of the electro-magnet 1. One end 0]. the coil surrounding .l. isconnected to the core, and hence it receives the current which isconveyed from the other end of the coil. by a wire to the rod Q, andthence by a second wire to the other terminal, it. The shunt-circuitpasses up through the positive carbon from the coutact-springs IN N tothe device A, thence to the pivoted arm 13, and through thecontactpieces I to the column S, and through the electromagnet U to theterminal it. The are is struck by the eleetro-inaguct 1, which attractsan armature, .l., at the bottom of the ball-andsoelcet-jointedcarbon-holder U.

The position of the carbon may be adjusted by the socket-jointedcarbon-holder U, and the ball in the socket-joint can be tightened orloosened by the screw 1". The ball may be either split, so as to let thecarbon pass through it, or solid, so as to press on one side of thecarbon, or it may be hollow.

The motion 01' the armature, which is guided by the non-n1agnetic pin V,is opposed by the spring \V, which can be adjusted by the screwed plugX. Similarl y, the resistance ofi'ered to the attract-ital oi the magnetG can be varied by the screw Y.

Z is a deflecting-cup to shield the lamp i'roln the-risii'ig gases, andM. is a dust cap or casing to protect the fixed device l] and mechanismabove.

The springs l N, which convey the current to the upper carbon, may in.some cases be made to perform the ollice ot' the lixed device l), aswell as their own.

.i am aware that catches have been used. which press lirnily against thesides of a rod. supporting a carbon, and thus prevent its downward.motion, but so placed as to permit its motion in an upward direction.Nor do l: herein claim, broadly, elastic lingers or :l'eelers set in aFoundation of metal, leather, or imlia-rubber, which take a .trietionalhold oi the carbon, feeding it forward when moving in one direction, andslide over it when moving in the opposite direction, as the same aredescribed and claimed in my pending application No. 113,016; but

\Vhat l claim is- 1. in an electric-arelamp, the fixed carbonholdcr ll,provided with lingers, leelers, or wires set in a .l'oumlation of metal,leather, or indiarubber, or other suitable material, and a suitableadjusting device, such as slnnrn, whereby the hold upon. the carbon isincreased or diminished, substantially as de scribed.

2. In an electric-arc lamp, the eombinatioh. of an electro-magnet orsolenoid whose circuit is closed or short-cireuited whenever the de vicemakes its stroke, with the vibr: reciprocating device A, iorined of etgers, as described, and the fixed braking earbon-holcler ot' the samekind, substantially as described.

3. In an electric-arc lamp, the combination of the spring .lli, nevidedwith an :uljustin;.g screw, Ti, carbon-holder A, ivoted arm 13,contact-piece 1i, column b, electroniagnet it, fixed. carbon-ho1der lil,casing 1i, contactsprings N 351', and dnsteap Z, substantially asdescribed.

st. in an electricarc lamp, the spring .li', pivoted arm .13, vibratingcarbon-holder A, eleetro-inagnet U, and stationary rarboir holder isubstantially as descr.il. ed.

fit 1

